With NFS V3.0 the NFS protocol versions 2 and 3 can be used simultaneously. When a connection is established between the client and server, the computers agree on which NFS protocol version can be used (see also the v2 parameter of the mount command).
NFS V3.0 is based on the UDP protocol (User Datagram Protocol). This is a connection-less (unreliable) protocol, i.e. data packets are sent without the transport layer checking whether or not they actually reach the destination computer. Any communication problems that arise are regulated by a higher network layer, i.e. the NFS itself. If the server does not respond within a specific period, the client repeats the request and an error message is output if necessary. This ensures secure data transmission, at the cost of additional network load.
In comparison with the NFS protocol version 2, version 3 of the protocol achieves better performance without compromising reliability of network access. This is primarily due to saving on calls for determining file attributes.
NFS V3.0 also allows you to mount file systems containing files larger than 2 GB.